Speed Pro - Forged - 4.310 in Bore - 5/64 x 5/64 x 3/16 in Ring Grooves - Plus 24.3 cc - Coated Skirt - Big Block Chevy - Set of 8. 454ci Open Chamber Race Piston, .060'' Overbore Piston Dia.: 4.310'' Piston Top: 25.7cc Dome Pressed Pin Comp Ratio: 11.31:1 w/100.9cc Heads, 9.61:1 w/119cc Heads Ring Grooves: 5/64'', 5/64'', 3/16''
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